Fan structure



June 30, 1931. F. .1 RAYFIELD I 6 FAN STRUCTURE Filed Nov.

Patented June 30, 1931', r

FREDERICK J.1RAYFIELD, oncmcaso, ILLINoI's'AssIG on. TO cnAMPIoN-rmioii ric MACHINERY COMPANY, or CHICAGOHILLINOIS, A commands or ILLINOIS FAN STRU TURE 'Application filed November 15, 1929. Serial No. 407,385.

My invention relates to fanstructures par ticularly adaptable for association with coinpressors for cooling the com pression cylinders thereof.

5 An important object of theinvention is to provide a fan structure which can be mounted a on the crank shaft of the compressor and i which has vanesurfaces localized an'dpositioned to project large volumes of air toward 1 the compressor cylinders for keeping them cool. I l A I A further object of the invention is to pro vide a combined fan and fly-wheel structure 1 comprising spokes and a rim, withthe spokes widened out at their ends and having the proper angle or curvature to propel large volumes of air and to localize the air where cooling is desired. There the structure is having radiating cylinder structures there on, the vane surfaces will be opposite the cylinders so that the projected. air will belocalized and concentrated on the cylinders to effect cooling thereof.

fly-wheel and fan structure forreceiving a driving belt for driving theapparatus' with-- structure showing my improved fan fly-wheel mounted on the crank shaft thereof; a

wheel structure; and c Figure 3 is an enlarged section on-plane III+-III of FigureZ. 1 As shown, the fan fly-Wheel structurecomprises a hub 10 from which radiate spokes 11 whose outer ends are joined by arim 12. The hub may be split as shown and provided with: flanges 13 by means ofwhich it may frictionally clamp a shaft on which the structure is'mounted. The hub may also have a keyway 14, whereby it may be "more securely r applied to a shaftby means offa suitable key.

senting extensive cooling area.

.tensive vane "surfaces.

mounted on'the crank shaft of a compressor As shown in Figure 1, the structure is plied to the crank shaft 15 0f a compressor structure C and a key 14;. on the shaft will engage in the keyway 14 of the structure.

cylinders 16 extending radiallyand which it isrdesired to cool. The cylinders may have radiator'fins or flanges 17 thereon for pm- The spokes ofthe 'fan fly-wheel structure are extended or widened and given the proper angle or curvatures to produce large and ex- VVherethe fan flywheel structure is used-in connection with a device such as the compressor structure described, it isdesirable and more efiicient to localize the vane surfaces so thatpracticallyall of the air propelled by the structure will be directed to the cylinders. L-therefore, I

expand and extend the spokes at'their outer ends to form the vane sections 18 to be opposite the cylinders whichare to be cooled when a the fan device is rotated. IThe localized vane r I sections extend diagonally across the rim 12 A further ob'ect is to adapt the combined at the proper angle or curvature forthe efli-Q cientpropulsion and projection of air. By 1 having the expanded vane sections at the. other ends of the spokes, the center of gravity of the spokes ,is moved outwardly toward the rim 12 and} the weight of the expanded vane sections added to that of the rim will I greatly increase the fly-wheel efficiency. Figure 2 is aside elei' ation of the fan fly;

' ment can be made withoutdeparting from the spirit and scope of the invention, and I, therefore, do not desire to be limited'except as will be necessitated by the prior art.'. f I claim as follows: c

A combined flywheel and fan comprising a hub, a rim, flat spokes radiating from said so" a "wheel, may also function as. a driving pulley g i hub to said rim, said spokes being entirely Within the side planes of said rim and being in planes at diagonals With said hub and rim, the outer sections of said spokes for a distance radially inwardly from their outer ends being of a Width to extend from side to side of said rim to form vanes, said spokes at their inner ends extending only a short distance along said hub from one end thereof and gradually expanding in Width to the outer sections.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County, Illinois.

FREDERICK J. RAYFl ELI) 

